NoteTo ensure optimal battery performance, we advise that the battery contacts are regularly cleaned. Our electronic cigarette batteries contain micro-electronic circuitry and microprocessors. Users should store and handle these items with special care, and we advise our customers not to store their electronic cigarettes near metallic or magnetized objects, or electronic transmitting devices, such as keys and mobile phones and to avoid extremely high or low storage temperatures. Taking these precautions will help to increase the lifespan and functional use of your devices.